Here's a tidbit from the Operations tablet on how to get such information

_side is a side object
_veh is a vehicle object
_name is the callsign string

_transportArray = NEO_radioLogic getVariable [format ["NEO_radioTrasportArray_%1", _side], []];
{
    private _veh = _x select 0;
    private _name = _x select 2;
    _sources pushback [_veh,_name]
} foreach _transportArray;

_casArray = NEO_radioLogic getVariable [format ["NEO_radioCasArray_%1", _side], []];
{
    private _veh = _x select 0;
    private _name = _x select 2;
    _sources pushback [_veh,_name]
} foreach _casArray;